One of archaeology's most compelling mysteries is that of the 13 crystal skulls. The crystal skulls have been some of the most powerful mystical symbols in human history. Several "perfect" crystal skulls have been found in parts of Mexico and Central and South America. Together, they form a mystery as enigmatic as the Great Pyramids and Stonehenge.

This summer the connection will become known worldwide, with the release of the new Indiana Jones movie, Indiana Jones and the Kingdom of the Crystal Skull.

Hosted by Lester Holt, SCI FI's investigative special Mystery of the Crystal Skulls will explore the history of these perplexing artifacts — the myths, the legends, the controversies, and the secret scientific tests performed on them behind closed doors.

But if we wish to comprehend their deepest mysteries, we must hurry. According to the prophecy, only by reuniting all or nearly all of the 13 crystal skulls can humankind unlock secrets that will allow us to avoid the apocalypse predicted by the ancient Mayan calendar — which comes to end on Dec. 21, 2012.